2017-01-012024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/681463摘要：本計畫為執行中央地質調查所推動之4年期「臺灣東北海域礦產資源潛能調查：震測及地熱流調查研究」工作，以震測與地熱流調查在臺灣東北海域南沖繩海槽進行金屬礦產開發潛能之調查與探勘研究，一以了解東北海域受海底火山活動產生的熱液換質作用是否亦有金屬硫化礦物的資源潛能，二則以震測與地熱流調查資料進而討論南沖繩海槽的地質背景與地體構造形貌，來推測地質活動作用在東北海域金屬礦產生成中所扮演的角色。由「總計畫與礦產資源調查成果資料庫」負責整個計畫之統整、規劃與協調工作，並且維護與更新東北海域礦產資源調查成果資料庫及資訊網，已達到調查成果資料保存目的外，另有4個分項計畫： (1)反射震測與海底回聲剖面調查研究：本年度將依上、下年度執行不同的計畫內容。前半年工作重點將持續對105年度收集之資料進行進一步處理、分析與解釋。後半年度則基於前半年工作成果，規劃於臺灣東北海域調查區域Ａ區2維多頻道反射震測調查內容，並進行其資料處理、分析、模擬與解釋，藉以了解此區域的地質背景。(2)地熱流調查研究：為瞭解海床下溫度的分布，並推估熱流分布情形，本年度將整編臺灣東北海域所有地熱流測量資料，完成地溫梯度、熱導係數等資料分析。並配合同年度震測工作，擇適當地點沿垂直構造走向收集5個測點海床下原地溫度和沉積物熱導係數，並進行地熱流測量資料整編和相關圖資繪製。(3)流體移棲模式研究：本年度將先利用地熱資料模擬且量化流體移棲的相關數據外，亦將結合各分項計畫與地球化學與海床觀測調查研究計畫成果，嘗試研發流體通量之估計方法，以瞭解噴氣孔所噴出之流體流速與熱通量。(4)地質構造、火成活動與沉積特徵研究：利用彙整好的計畫區域發表之文獻與報告，以及解釋並綜整臺灣東北海域調查區域A 區所有反射震測資料，建立南沖繩海槽( A區)地體構造、火成活動與沉積環境的地質初始模式。 上年度計畫對臺灣東北海域調查區域A區已經進行一年的觀測與調查，本年度計畫接續上年度的研究成果，可以對此區域進行更詳細完整與特定區域的調查及分析，而對此區域有更完整的背景掌握。利用綜整既有與本年度預計收集的資料及分析結果，可總結論述東北海域A區金屬礦產開發潛能研究成果，並能達到更進一步探討在高潛能礦產區域進行海底礦產資源評估之目的，以及瞭解此區域內礦物可能生成模式、環境與其地質背景及地體構造活動之可能關聯性。<br> Abstract: This proposal is the 2nd year of the 4-year mineral resource investigation project entitled “Investigation of mineral resource potential in the northeastern Taiwan offshore areas: Seismic and heat flow studies”. Seismic, heat flow and geothermal investigations will be carried out in the areas offshore northeastern Taiwan with 2 major goals: 1. To explore the mineral resource potential in the investigation area where submarine volcanic activities are prevailing; 2. To understand the relationships between geological and tectonic processes and the mineral resources in the study area. To achieve these goals, a team consists of several scientists/researchers involved in the previous gas hydrate investigation projects of the Central Geological Survey (CGS) has been formed to carry out this project. Based on the needs of applying various investigation techniques and approaches, this project will be carried out by one master project and 4 sub-projects. The master project is responsible for the project planning and coordination among different sub-projects, also to maintain a marine mineral resource database. The 4 sub-projects and their respective roles are described below: (1) Seismic reflection and chirp sonar investigations: Base on the schedule of the reserach vessel, this sub-project will arrange for the seismic reflection survey in the investigation area. After that, 2D seismic reflection data and underway chirp sonar data in the survey area will be collected, processed and analyzed. This sub-project will focus on analyzing each 2D seismic profile and chirp sonar data for volcanic activities, hydrothermal vents and structural and sedimentary processes. (2) The heat flow investigation sub-project will firstly integrate all the existing heat flow measurements off NE Taiwan and perform data analyses to obtain background information such as thermal gradients and thermal conductivity. The sub-project then will conduct heat flow measurements at selected 5 stations along 2-D seismic profiles, and will process and analyze these new data. (3) Fluid migration modeling: This sub-project plans to construct the refering thermal field model from the existing geothermal data. This year, the volume analysis of the fluid migratioin will be developed with combining all results of all sub-domains. (4) Stratigraphic analyses and sedimentary characteristics of the Southern Okinawa Trough: This sub-project will try to understand the evolution of tectonic architectures and sedimentary environments from interpretation of structural features in the study area by integrating seismic data in the survey area. This sub-project will also suggest the initial system with tectonic structure, volcanic activities and stratigraphy by summerizing geological and geophysical data. Overall, this project aims to define the distribution of submarine mineral resources and to evaluate their development potential. Build on last year’s results, the important areas and specific targets in box A will be investigated, and survey box A will be completed. Also, this project will discuss the possible relationships between mineral resource, geological background and tectonic activities.礦產資源臺灣東北海域反射震測熱流地溫梯度地熱流量測地體構造沈積環境Mineral ResourceOffshore Northeastern TaiwanSeismic explorationHeat flowThermal gradientTectonic frameworkSedimentary environment.臺灣東北海域礦產資源潛能調查-震測及地熱流調查研究(2/4)